Thread: Octane-Compression Ratio
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11-30-2010 07:20 AM #5
CHR Member
- Join Date
- Jan 2004
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- Macomb
- Car Year, Make, Model: '32 Ford 3W Coupe, 383 sbc
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It is not static compression ratio that guides what octane to use but dynamic compression ratio. My 383 has 10.6:1 static compression but I can run 92 octane just fine because I run aluminum heads and my dynamic compression ratio is 8.46. You can run .5 more dynamic compression if you have aluminum heads. Engine temperature is also a factor. A hotter running engine will not tolerate as much compression. Cam timing, quench, and connecting rod length all play a part.Last edited by rumrumm; 11-30-2010 at 07:25 AM.
Lynn
'32 3W
There's no 12 step program for stupid!
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